WaPo:

Last week, a Ukrainian lawmaker who was once affiliated with a pro-Russian political party and has met with Giuliani released 10 edited snippets of what appeared to be Biden’s official vice presidential phone calls in 2016 with Petro Poroshenko, then the president of Ukraine. It was the second cache of recordings the lawmaker, who studied under the KGB in Moscow in the early 1990s, has released since May.

The recordings show that Biden, as he has previously said publicly, linked loan guarantees for Ukraine to the ouster of the country’s prosecutor general. The tapes do not provide evidence to back Giuliani’s long-standing accusation that Biden sought to have him fired to block an investigation of a gas company that had hired his son Hunter.

The authenticity of the audio files, which appear heavily edited, could not be verified. The Ukrainian government is investigating how they were obtained. Biden’s campaign has said they are part of an effort to concoct conspiracy theories to smear him. Poroshenko has gone further and called them fake.